Able seaman and Old salt

Able seaman noun - A seaman in the merchant marine; trained in special skills.

Old salt and able seaman are semantically related. In some cases you can use "Old salt" instead a noun phrase "Able seaman".

Old salt noun - A man who serves as a sailor.

Able seaman and old salt are semantically related. Sometimes you can replace phrase "Able seaman" with "Old salt", this phrases are similar.